Hex #66bf80 or rgb(102,191,128) in RGB space is the tint of bluish green. It has hue angle of 137.53 degrees, value = 75 and saturation = 47. #66bf80 can be obtained by mixing 4 colors: 3 drops of yellow, 4 drops of cyan, 1 drop of white, 2 drops of black.
Nearest safe hex - #66cc99. Below you can see the block with #66bf80 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66bf80 to the mixer and play with it.